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Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
OL-12189-01
Chapter 24 Configuring IPv6 MLD Snooping
Configuring IPv6 MLD Snooping
• The maximum number of multicast entries allowed on the switch or switch stack is determined by
the configured SDM template.
• The maximum number of address entries allowed for the switch or switch stack is 1000.
Enabling or Disabling MLD Snooping
By default, IPv6 MLD snooping is globally disabled on the switch and enabled on all VLANs. When
MLD snooping is globally disabled, it is also disabled on all VLANs. When you globally enable MLD
snooping, the VLAN configuration overrides the global configuration. That is, MLD snooping is enabled
only on VLAN interfaces in the default state (enabled).
You can enable and disable MLD snooping on a per-VLAN basis or for a range of VLANs, but if you
globally disable MLD snooping, it is disabled in all VLANs. If global snooping is enabled, you can
enable or disable VLAN snooping.
Beginning in privileged EXEC mode, follow these steps to globally enable MLD snooping on the switch:
To globally disable MLD snooping on the switch, use the no ipv6 mld snooping global configuration
command.
Beginning in privileged EXEC mode, follow these steps to enable MLD snooping on a VLAN.
Note On a Catalyst Switch Module 3110, when the IPv6 multicast router is a Catalyst 6500 switch and you
are using extended VLANs (in the range 1006 to 4094), IPv6 MLD snooping must be enabled on the
extended VLAN on the Catalyst 6500 switch in order for the switch to receive queries on the VLAN. For
normal-range VLANs (1 to 1005), it is not necessary to enable IPv6 MLD snooping on the VLAN on the
Catalyst 6500 switch.
On a Catalyst Switch Module 3012, when the IPv6 multicast router is a Catalyst switch and you are using
extended VLANs (in the range 1006 to 4094), IPv6 MLD snooping must be enabled on the extended
VLAN on the Catalyst switch in order for the switch to receive queries on the VLAN. For normal-range
VLANs (1 to 1005), it is not necessary to enable IPv6 MLD snooping on the VLAN on the Catalyst
switch.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ipv6 mld snooping Globally enable MLD snooping on the switch.
Step 3
end Return to privileged EXEC mode.
Step 4
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ipv6 mld snooping Globally enable MLD snooping on the switch.
